From 8a0daa0c8fd2180f9ad8d1fc0786a1287b345bc4 Mon Sep 17 00:00:00 2001
From: laserpants <johannes@isomorphic.co>
Date: Wed, 27 Apr 2016 02:14:39 +0300
Subject: [PATCH] implement toggle action for icon menu

---
 components/iconmenu.cpp | 78 ++++++++++++++++++++++++++++++++++++++---
 components/iconmenu.h   | 30 +++++++++++++---
 2 files changed, 98 insertions(+), 10 deletions(-)

diff --git a/components/iconmenu.cpp b/components/iconmenu.cpp
index 42f49e2..18ccb4f 100644
--- a/components/iconmenu.cpp
+++ b/components/iconmenu.cpp
@@ -1,5 +1,8 @@
 #include <QEvent>
 #include <QLayout>
+#include <QPropertyAnimation>
+#include <QDebug>
+#include <QPainter>
 #include "iconmenu.h"
 #include "menu.h"
 
@@ -7,6 +10,7 @@ MenuOverlay::MenuOverlay(QWidget *parent)
     : QWidget(parent)
 {
     setAttribute(Qt::WA_NoSystemBackground);
+    setAttribute(Qt::WA_TransparentForMouseEvents);
 }
 
 MenuOverlay::~MenuOverlay()
@@ -15,11 +19,27 @@ MenuOverlay::~MenuOverlay()
 
 IconMenu::IconMenu(const QIcon &icon, QWidget *parent)
     : IconButton(icon, parent),
-      _menuOverlay(new MenuOverlay(parent)),
+      _menuOverlay(new MenuOverlay),
       _menu(new Menu(_menuOverlay)),
-      _menuGeometryWidget(0)
+      _animation(new QPropertyAnimation(this)),
+      _menuVisible(false),
+      _progress(0)
 {
     setCheckable(true);
+    setOverlayParent(parent);
+
+    _animation->setPropertyName("progress");
+    _animation->setTargetObject(this);
+    _animation->setDuration(350);
+    _animation->setStartValue(1);
+    _animation->setEndValue(0);
+
+    _menu->hide();
+
+    _menuOverlay->installEventFilter(this);
+
+    connect(this, SIGNAL(clicked(bool)), this, SLOT(toggleMenu()));
+    connect(_animation, SIGNAL(finished()), this, SLOT(animationFinished()));
 
     _menu->addMenuItem("Maps");
     _menu->addMenuItem("Books");
@@ -31,17 +51,65 @@ IconMenu::~IconMenu()
 {
 }
 
+void IconMenu::setProgress(qreal progress)
+{
+    if (_progress == progress)
+        return;
+    _progress = progress;
+
+    emit progressChanged(progress);
+    update();
+}
+
 void IconMenu::setOverlayParent(QWidget *parent)
 {
     _menuOverlay->setParent(parent);
 }
 
+void IconMenu::toggleMenu()
+{
+    _animation->setDirection(_menuVisible
+        ? QAbstractAnimation::Forward
+        : QAbstractAnimation::Backward);
+    _animation->start();
+
+    _menuVisible = !_menuVisible;
+
+    if (_menuVisible) {
+        _menu->show();
+        _menuOverlay->setAttribute(Qt::WA_TransparentForMouseEvents, false);
+    }
+}
+
+void IconMenu::animationFinished()
+{
+    if (!_menuVisible) {
+        _menu->hide();
+        _menuOverlay->setAttribute(Qt::WA_TransparentForMouseEvents, true);
+    }
+}
+
+bool IconMenu::eventFilter(QObject *obj, QEvent *event)
+{
+    if (QEvent::MouseButtonRelease == event->type() && _menuOverlay == obj)
+        toggleMenu();
+    return IconButton::eventFilter(obj, event);
+}
+
 bool IconMenu::event(QEvent *event)
 {
-    if (QEvent::ParentChange == event->type()) {
+    const QEvent::Type &type = event->type();
+    if (QEvent::ParentChange == type) {
         setOverlayParent(parentWidget());
-        QSize hint = _menu->layout()->sizeHint();
-        _menuOverlay->setGeometry(0, 0, hint.width(), hint.height());
+        updateOverlayGeometry();
+    } else if (QEvent::Move == type || QEvent::Resize == type) {
+        _menuPos = parentWidget()->mapToParent(pos());
+        updateOverlayGeometry();
     }
     return IconButton::event(event);
 }
+
+void IconMenu::updateOverlayGeometry()
+{
+    _menu->setGeometry(QRect(_menuPos, _menu->layout()->sizeHint()));
+}
diff --git a/components/iconmenu.h b/components/iconmenu.h
index fd73629..7aef37c 100644
--- a/components/iconmenu.h
+++ b/components/iconmenu.h
@@ -2,10 +2,9 @@
 #define ICONMENU_H
 
 #include <QWidget>
+#include <QPoint>
 #include "iconbutton.h"
 
-class Menu;
-
 class MenuOverlay : public QWidget
 {
     Q_OBJECT
@@ -15,23 +14,44 @@ public:
     ~MenuOverlay();
 };
 
+class QPropertyAnimation;
+class Menu;
+
 class IconMenu : public IconButton
 {
     Q_OBJECT
 
+    Q_PROPERTY(qreal progress WRITE setProgress READ progress NOTIFY progressChanged)
+
 public:
     explicit IconMenu(const QIcon &icon, QWidget *parent = 0);
     ~IconMenu();
 
+    void setProgress(qreal progress);
+    inline qreal progress() const { return _progress; }
+
     void setOverlayParent(QWidget *parent);
 
+protected slots:
+    void toggleMenu();
+    void animationFinished();
+
+signals:
+    void progressChanged(qreal);
+
 protected:
+    bool eventFilter(QObject *obj, QEvent *event) Q_DECL_OVERRIDE;
     bool event(QEvent *event) Q_DECL_OVERRIDE;
 
+    void updateOverlayGeometry();
+
 private:
-    MenuOverlay   *const _menuOverlay;
-    Menu          *const _menu;
-    QWidget       *_menuGeometryWidget;
+    MenuOverlay        *const _menuOverlay;
+    Menu               *const _menu;
+    QPropertyAnimation *const _animation;
+    QPoint                    _menuPos;
+    bool                      _menuVisible;
+    qreal                     _progress;
 };
 
 #endif // ICONMENU_H